This website is a repository of knowledge accumulated in the course of designing our own high-altitude balloon experiments. In it, you will find a summary of: the relevant science of the upper atmosphere and of balloon flight; engineering design & construction concepts behind the balloon and near-spacecraft; and, details behind each flight (successful or not). There's a blog at the end where you can post your comments. It's a work-in-progress: we'll keep adding information as we can. Enjoy!